[VP9 decoder] react to incorrect pixel format in the bitstream
[VP9 decoder] react to incorrect pixel format in the bitstream

Bug: chromium:1063490
Change-Id: Ibac3b43b42c1b088b6ac94ae327f23b11d3fd259
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/171225
Reviewed-by: Erik Språng <3ab8c90c99d6dd7822e0fad803ab0211dd287ae5@webrtc.org>
Commit-Queue: Ilya Nikolaevskiy <76788ac3efd229e9d156135d9ceb7fef65c45da4@webrtc.org>
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#30855}

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